Romelu Lukaku aimed a jibe at Zlatan Ibrahimovic after Inter were crowned Serie A champions on Sunday.
In the last Milan derby, the former Manchester United teammates clashed on the ground, tensions have remained high since.
“Milan never had a king, they have a god,” Ibrahimovic said at the time.
But after Inter received the Scudetto after Sassuolo’s draw with Atalanta, Lukaku took to social media.
“The true god crowned the king!” Lukaku wrote on Twitter on Sunday.
“Now bow down. King of Milan!”